Question

我正在开发一个为数组提供用户输入的程序。我有FindLowestTempInArray的一种方法返回最低日（数组中的位置）。我想在main方法中打印索引和该位置的值。我一直在寻找，我不知道一个简单的方法来做到这一点。现在我刚刚从方法中打印数据而没有返回值。这有效，但我想知道如何从主要打印值。所以我想知道的是如何从main中的方法打印最低温度和最低温度。

这是我的代码：

public static int FindLowestTempInArray(int[] T)
{
    // Returns the index of the lowest temperature in array T
    int lowestTemp = Uninitialized;
    int lowestDay = 0;

    for(int day = 0; day < T.length; day++)
    {
             if(T[day] != Uninitialized && ( T[day] < lowestTemp || lowestTemp == Uninitialized))
             {
                     lowestTemp = T[day];
                     lowestDay = day;     

                     return lowestTemp;
             }            
    }
    return lowestDay;   
}    

public class Weather {

private static final int Uninitialized = -999;

public static void main(String[] args) {
    // TODO Auto-generated method stub

    int [] high = new int[32];
    int [] low = new int[32];

    Init (high);
    Init(low);

    LoadData(high,low);
    Report(high, low);

    FindAvg(high);
    //FindAvg(low);
    //why do i not need to do both the one above and FindAvg(low);
    System.out.println("The average for the high is: " + FindAvg(high));
    System.out.println("The average for the low is: " + FindAvg(low));

    //Lowest(high, low);

    FindLowestTempInArray(high);
    System.out.println(FindLowestTempInArray(high) + "\n" + FindLowestTempInArray(low));


    Highest(high,low);

    System.out.println("\n" + "The highest high is: " + Highest(high, low) + " degrees." + "\n" +
            "This temperature was recorded on day: " + Highest(high, low)); 
    System.out.println("\n" + "The highest low is: " + Highest(low, high) + " degrees." + "\n" +
            "This temperature was recorded on day: " + Highest(low, high));



//  LeastToGreatest(high, low);
}

Answer 1

一种方法是将public static int FindLowestTempInArray(int[] T)的返回类型更改为int[]，以便您可以返回这两个值。否则，只要执行一个return语句，就会退出该方法。

你可以使用当天的最低[0]和最低的[1]，反之亦然。

另一种方法是分别获取这两个值（使用参数来区分您想要的返回值）并将它们存储在两个变量中。我们的想法是将这些值存储在main方法的某个位置，以便能够使用它们。

执行此操作后，您可以根据需要使用System.out显示值。

Answer 2

有两种方式：

将FindLowestTempInArray的返回类型更改为int []，即整数数组，并说int [0]为最低温度，int [1]为最低日期
你可以创建一个新类，说温度有2个类变量说温度和日，在你的方法FindLowestTempInArray你可以有返回类型的温度，你可以在该方法中设置温度对象。

以下是返回类型int []的示例。

public class Weather {

private static final int Uninitialized = -999;

public static void main(String[] args) {

    int[] low = new int[args.length];

    for (int i = 0; i < args.length; i++) {
        System.out.print(args[i] + " ");
        low[i] = Integer.parseInt(args[i]);
    }
    System.out.println("\n");
    int[] lowest = new int[2];
    lowest = FindLowestTempInArray(low);
    System.out.println(lowest[0] + "   " + lowest[1]);

}

public static int[] FindLowestTempInArray(int[] T) {
    int[] lowest = new int[2];
    lowest[0] = Uninitialized;
    lowest[1] = 0;
    for (int day = 0; day < T.length; day++) {
        if (T[day] != Uninitialized
                && (T[day] < lowest[0] || lowest[0] == Uninitialized)) {
            lowest[0] = T[day];
            lowest[1] = day;
        }
    }
    return lowest;
}

}

解决方案2（内部类）：

public class Weather {

private static final int Uninitialized = -999;

public static void main(String[] args) {

    int[] low = new int[args.length];

    for (int i = 0; i < args.length; i++) {
        System.out.print(args[i] + " ");
        low[i] = Integer.parseInt(args[i]);
    }
    System.out.println("\n");

    Weather.Temperature temp = FindLowestTempInArray(low);
    System.out.println(temp.temperature + "   " + temp.day);

}

public static Weather.Temperature FindLowestTempInArray(int[] T) {

    Weather.Temperature temp=new Weather.Temperature();
    temp.temperature = Uninitialized;
    temp.day = 0;
    for (int day = 0; day < T.length; day++) {
        if (T[day] != Uninitialized
                && (T[day] < temp.temperature || temp.temperature == Uninitialized)) {
            temp.temperature = T[day];
            temp.day = day;
        }
    }
    return temp;
}

static class Temperature{
    private int temperature;
    private int day;

    public int getTemperature() {
        return temperature;
    }
    public void setTemperature(int temperature) {
        this.temperature = temperature;
    }
    public int getDay() {
        return day;
    }
    public void setDay(int day) {
        this.day = day;
    }
}

}

从方法打印数组的值和位置

2 个答案: